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Yes, there is deceleration in case of ICBM warheads also. The warhead has wings & tailfins to allow them to float and glide at a reduced speed. Other methods are lifting-body shape of warhead. Here the shape is opposite of aerodynamic..meaning this shape induces tremendous drag through the...

It is not the case. Even decades old technique of covering the US Space Shuttle with Silica Tiles worked and the shuttle returned unburnt. For MIRV, SHARP materials (there are quite a few) capable of withstanding 3600° C at Mach 11 are used. Even Ceramics are good heat-shields. Heat-shields for...

That is what MaRVs are supposed to be; China perfected it in 2006.

With a 3 ton MIRV warhead, the range of Agni 6 will be 5000 km. However, with MaRV, the self-propelled warheads can potentially travel 1000 km further, making the effective range 6000 km...

Reentry vehicle with heat-shield is there in the nuclear-capable Agni-III also. IMO the key technology to realise with MIRV is deploying multiple war-heads from the booster vehicle with precision timing. In case of MaRV, though, additional requirement will be self-propelled war-heads with...